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Performance Sports GroupPSG named Harlan Kent as its new Chief Executive Officer and lowered its earnings outlook. Performance Sports Group shares fell 6.88 percent to $3.25 in the after-hours trading session.

Wall Street expects Mattress Firm Holding CorpMFRM to post a quarterly loss at $0.04 per share on revenue of $867.20 million. Mattress Firm shares gained 0.91 percent to close at $34.35 on Wednesday.

Envision Healthcare Holdings IncEVHC is said to be in discussions with Amsurg CorpAMSG, regarding a potential merger, according to sources as reported by Dow Jones on Wednesday. A deal could be announced as early as next week, the sources said. Envision Healthcare shares gained 9.12 percent to $28 in the after-hours trading session, while Amsurg shares slipped 2.53 percent to $76 in after-hours trading.

Analysts are expecting Vail Resorts, Inc. MTN to have earned $4.20 per share on revenue of $652.63 million in the latest quarter. Vail Resorts shares slipped 0.14 percent to close at $135.24 on Wednesday.